668735552 has 56 divisors (see below), whose sum is σ = 1426707840. Its totient is φ = 310003200.

The previous prime is 668735549. The next prime is 668735569. The reversal of 668735552 is 255537866.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a junction number, because it is equal to n+sod(n) for n = 668735497 and 668735506.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51302 + ... + 63002.

Almost surely, 2^668735552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668735552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (713353920).

668735552 is an abundant number, since it is smaller than the sum of its proper divisors (757972288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

668735552 is a wasteful number, since it uses less digits than its factorization.

668735552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11779 (or 11769 counting only the distinct ones).

The product of its digits is 1512000, while the sum is 47.

The square root of 668735552 is about 25859.9217322868. The cubic root of 668735552 is about 874.4832004564.

The spelling of 668735552 in words is "six hundred sixty-eight million, seven hundred thirty-five thousand, five hundred fifty-two".